Coil-former for armatures.



WITNESSES J. A. WIRTH.

COIL FORMER FOR ARMATURES.

APPLICATION FILED 1AN.26, 1910.

Patented June 1, 1915.

3 SHEETS-SHEET I.

THE NORRIS PETERS C04, PHOTO-LITHO., VIASHINGTUN, Dv C.

l. A. WIRTH.

COIL FORMER FOR ARMATURES.

APPLICATION FILED lAN.26,1910.

1 9 1 1 9 1 66 m Patented June 1, 1915.

3 SHEETS-SHEET 2.

LLlJ

WITNESSES: M

THE NORRIS PETERS co.. F'HOTO-LITHOH WASHINGTON. D. 4

I 1. A. WIRTH.

COIL FORMER FOR ARMATURES.

APPLICATION FILED JANIZB, 1910.

1 9 1 1 9 1 m Patented June 1, 1915.

3 SHEETS-SHEET 3.

WITNESSES:

IN ENTOR 2%? v a ATTORNEY THE NORRIS PETERS 00., PHOTO-LITHOH WASHINGTON, D. c

IINI

JOHN A. WIRTH, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0 WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

COIL-FORMER FOR ARMATURES.

Application filed January 26, 1910.

To all whom it may concern:

Be it known that I, JOHN A. WIRTH, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Coil-Formers for Armatures, of which the following is a specification.

My invention relates to apparatus for forming armature coils for dynamo-electric machines, and it has special reference to the formation of half-turn armature coils.

The object of my invention is to provide simple forming apparatus which shall be adjustable to suit armature coils of different sizes and be adapted for readily and accurately producing coils of the type above indicated.

In Patent No. 838,017, granted December 11, 1906, to the Westinghouse Electric & Manufacturing Company, as assignee of William H. Foot, a coil former is shown and described which comprises a base or stand having a substantially cylindrical surface and a plurality of steel blocks or forming tools adjustably secured to the base. In forming coils by means of devices of this character, it has heretofore been usual to cut off the required number of lengths of copper strap, or some other conductor of which the coil is to be constructed, and produce all of the bends by means of a block and a mallet, and, when the forming process is complete, to cut off the ends of the conductors to the required dimensions. In using this method, some of the conducting material is scrapped because it is impossible to accurately determine the proper lengths for the conductors when the forming process is commenced. Furthermore, considerable time is consumed in producing the bends and particularly in producing what are known as the radius bends, which are located at the ends of the armature core outside of the core slots, when the coils are assembled for constituting an armature winding.

According to my present invention, I provide a simple device, which I term, for con venience, a radius bender, for making the principal bends in a half-coil, said device having a gage by means of which the relative'positions of the several coil conductors may be so adjusted, when they are first clamped in the bender, that the terminals of the coil shall beof the desired length.

Specification of Letters Patent.

Patented June 1, 1915. Serial No. 540,210.

The coil, after being acted upon by the radius bender, may be placed on a former of the character shown and described in my 00- pendmg application Serial No. 710,029, which is a division of this application, and was filed July 17, 1912.

Figure l of the accompanying drawings is a plan view, and Fig. 2 is a front elevatlon, of the radius bender of my invention. Fig. 3 is a perspective view, on a larger scale, of one end of the device shown in Figs. 1 and 2.

Referring to the drawings, the radius bender here shown comprises a bed plate 1, which is supported upon a base 2 by means of uprights 3 and 4, but which may be supported in' any other suitable manner; a pair of similar forming members 5 and 6 that are adjustably supported upon the bed plate 1; bending blocks 7 and 8 that are rotatably supported upon pins 9 and 10 which project outwardly from the ends of the members 5 and 6; bending levers 11, 12 and 13, and a removable templet l4.

The members 5 and 6' are'provided with projections 15 and 16 which extend into guide ways 17 and 18 in the bed plate 1. Each of the members 5 and 6 is composed of a substantially rectangular block which is perpendicular to the central plane of the guide ways 17 and 18, and a forming tool 19, having a circumferentially curved edge surface, which is secured to the rectangular block and extends outwardly therefrom, as shown in Fig. 3.

The tools 19 are provided with projections 20 which extend into guide ways 21 in the rectangular blocks, the arrangement of parts being such that the tools are adjustable on a shoulder or ledge while their top surfaces are substantially in the same plane as the top surfaces of the blocks.

Bolts 22 are provided for clamping the blocks to the bed plate in any desired position, and bolts 23 are provided for clamping the tools 19 in position on the blocks. The slots 17, 18 and 21 may be of any suitable form in cross section, but are preferably of T-sha-pe corresponding to those usually found in the bed plates of planers, shapers and other machine tools.

The ends of the blocks 5 and 6, at the front end of the former, are notched to form one jaw of a clamp, a clamping strip 24: cooperating therewith to hold the conductors V chine.

in position during the coil-forming process. The strip 24 is removable and corresponds, in length, to the portion of the coil which lies in the core slot of a dynamo-electric ma- For coils of different dimensions, clamping strips of required length may be substituted for thestrip 24, and the blocks 5 and'6 may be adjusted toward or away from each other by loosening-the bolts 22 and by turning a feed screw 25, on opposite ends of which right-hand and left-hand threads are out. When the desired position is reached, the blocks are clamped firmly to the bed plate by tightening the bolts 22. Clamping blocks'26 and 27 are secured to the ends of the members 5 and 6 and overhang the clampingstrip 24, any suitable means, such as hand screws 28 being provided for forcing the outer ends of the clamping blocks downwardly.

Projecting upwardly from each of the tools 19 is a pin 33 on which the bending lever 11 may be pivoted, the lever being provided near its inner end with a hole 32 for engagement therewith. A bending roll or wheel 29 is .adjustably secured to the lever I by means of bolts .30 which extend through V a longitudinal slot .31 in the lever.

The templet 14 is mounted on a supporting bracket 34, to which it is removably secured by a bolt 35 and is provided with a notch 36 having a stepped bottom surface against which a series of conducting straps may rest. The bracket 34 comprises a strip 37which is rotatably mounted on a pin 38 projecting outwardly from one end of the bed plate 1, and an arm 39 to which the templetis secured. There is considerable lost motion betweentthe strip 37 and the pin 38, so that the templet end of the bracket may be supported by apin 40 which is adapted to engage an L-shaped notch 41, as desired.

The bending blocks 7 and 8 are adapte to produce the angle bends in the coil at the ends of the straight portion and are alike, except that they are arrangedto operate in opposite directions. The blocks 7 and 8 are rotatably supported upon the pins 9 and 10, which, as above indicated, project outwardly from the ends of the blocks 5 and 6. The pins are enlarged at their outer ends to prevent the removal of the blocks, but they are of sufiicient length to permit of the blocks being so moved out of the bending plane that they do not interfere with the operation of the radius bender.

The device is utilized as follows: The templet 14 is first set in position, as shown in Fig. 3, and the blocks 5 and 6 are adjusted upon the bed plate 1 to suit the size of the coil to be formed. A bundle of strap conductors is'then placed between the clamping jaws, atthe front ends of the jaws 5 and 6, and the relative positions of the conductors are determined by the templet 14, their ends being brought into engagement with the stepped surface of the notch 36. The conductors are then rigidly clamped in position by means of the hand screws 28, and the templet and templet bracket are swung out of the way. The lever 11 is next hooked upon the pin 33, as shown in Fig. l, the bending roll 29'having first been set to correspond to the tool 19 with which it cooperates. For different coils,the radius bend will vary somewhat, and, consequently, a number of the tools 19 having different radii are provided'for each device. In each case, the tool will be adjusted along the block to which it is to be secured until the guide surface 42 of the clamp is tangent to its forming surface. hen the lever 11 is first hooked to the pin 33, its center line is substantially parallel, and directly above, the slot 21 in the block 5. It is then rotated in a clockwise direction, thereby bending the strap conductors into conformity with the circumferential edge surface of the tool 19. The periphery of the bending roll 29 is flanged, in order to hold the strap conductors against lateral displacement. After this bend is made in the conductors, the lever 11 is removed and hooked upon the other pin, and the opposite ends of the conductors are bent to conform to the other tool 19. The lever is then removed and the blocks 7 and 8 are adjusted along the pins 9 and 10 into the positions shown in Fig. 3, eaelrhaving two of its surfaces in engagement with the notch in the outer end of one of the blocks 5 and 6.

Since thetwo blocks 7 and S are alike and operate inthe same way, only the block 7 'will be discussed with reference to Fig. 3

of the drawings. As here shown, a bending clamp 44 is rotatably mounted on pin projection 43 of the block 7, the lever 12 being secured to the bending clamp in order to facilitate the operation of the device. When the lever 12 is upright, as shown in Fig. 3, the bending clamp 44 is in substantial ahnement with the surfaces of the clamping blocks 26 and 27, and is in position to grip the strap conductors, which have already been bent, as above indicated, about the tool 19. The conductors are finally bent downwardly around the upper corner of the block 7 and are made to conform to the surface 45 of this block by rotating the lever 12 in a counter-clockwise direction.

I claim as my invention:

1. A former for armature half coils comprising a clamp for the straight portion of the coil, a relatively stationary forming tool having a circumferentially curved edge surface, means for forming one end of the half-coil on said relatively stationary tool,

and means for producing a relatively short bend in the half-coil at the end of the straight portion after the end of the coil is shaped on the curved surface of the forming tool, the axis of the said last-named bend being angularly disposed with respect to the axis of the said forming tool.

2. A former for armature half-coils comprising a clamp for the straight portion of the coil, a removable templet having a stepped notch adapted to be engaged by the ends of the conductors of an unformed halfcoil held in the clamp, a relatively stationary forming tool having a circumferentially curved edge surface, means for forming one end of the half-coil on the tool, and means for'producing a relatively short radius bend in the half-coil at the end of the straight portion after the end of the coil is shaped on the curved surface of the forming tool.

3. A former for armature half-coils comprising a clamp for the straight portion of the coil, a removable templet having a stepped notch adapted to be engaged by the ends of the conductors of an unformed halfcoil held in the clamp, a relatively stationary forming tool having a circumferentially curved edge surface, means for forming one end of the half-coil on the tool, and a rotatable bending block for producing a relatively short radius bend in the half-coil at the end of the straight portion.

4. A forming device for armature halfcoils comprising a supporting plate, a pair of clamping blocks adjustably supported thereon, relatively stationary forming tools having circumferentially curved edge surfaces and adjustably secured to the blocks, a single lever adapted to be pivoted at the center of curvature of either of the tools, a roll or wheel adjustably aflixed to the lever, and bending tools rotatably mounted at the ends of the blocks, the clamping jaws of said blocks being substantially tangent to the curved surfaces of said relatively stationary forming tools.

5. A forming device for armature halfcoils comprising an adjustable clamp for the straight portion of the coil that consists of two blocks having clamping jaws at corresponding ends, and means for adjusting the blocks toward and away from each other, forming tools having curved surfaces, adjustably supported by said blocks, and bending tools at the ends of the said blocks for producing bends in the half-coil at the ends of the straight portion after it is shaped on the forming tools.

6. A former for armature half-coils comprising a clamp for the straight portion of Copies of this patent may be obtained for five cents each, by addressing the the coil, a removable templet having a stepped notch adapted to be engaged by the ends of the conductors of an unformed halfcoil held in the clamp, a relatively stationary forming tool having a curved edge surface, a radially adjustable bending roll rotatably movable about the center of curvature of the forming tool, and a rotatable bending block arranged to produce a bend in the half-coil at the end of the straight portion after it is shaped on the curved surface of the relatively stationary forming tool, the engaging surfaces of the clamp being substantially tangent to the curved surface of the forming tool.

7. A former for multi-conductor armature half-coils comprising an adjustable clamp for the straight portion of the coil consisting of two blocks having clamping jaws at corresponding ends, and means for adjusting the blocks toward and away from each other, a removable templet having a stepped notch adapted to be engaged by the ends of the conductors of an unformed half-coil held in the clamp, relatively stationary forming tools having curved edge surfaces, a radially adjustable removable bending roll rotatably movable about the center of curvature of one of said forming tools, and bending blocks rotatably secured to the ends of said blocks and having bending clamps, and arranged to produce bends in the halfcoil at the ends of the straight portion after it is shaped on the curved surfaces of said relatively stationary forming tools, the clamping jaws of the blocks being substantially tangent to the curved edge surfaces of the forming tools.

8. A former for armature half-coils comprising a clamp for the straight portion of the coil, a relatively stationary forming tool having a curved edge surface, means for forming one end of the half-coil on said relatively stationary tool, and means for producing a bend in the half-coil at the end of the straight portion after the end of the coil is shaped on the curved surface of the forming tool, the axis of the said lastnamed bend being angularly disposed with respect to the axis of the said forming tool.

In testimony whereof, I have hereunto subscribed my name this 19th day of J an., 1910.

JOHN A. WIRTH.

Witnesses:

V. R. DITTMAN, B. B. HINES.

Commissioner of Patents,

Washington, D. G. 

